Bose Lifestyle 28 Manuel de dépannage - Page 29

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Type

BSEL

EPROM Boot Select. When BSEL is high, the ADSP-21065L is configured for

booting from 8-bit EPROM. When BSEL is low, the BSEL and BMS inputs

determine booting mode. See BMS for details. This signal is a system

configuration selection which should be hardwired.

____

I/O/T*

Boot Memory Select. Output Used as chip select for boot EPROM devices (when

BMS

BSEL = 1). In a multiprocessor system, BMS is output by the bus master. Input:

When low, indicates that no booting will occur and that ADSP-21065L will begin

executing instructions from external memory. See table below. This input is a

system configuration selection which should be hardwired. *Three-statable only in

EPROM boot mode (when BMS is an output).

BSEL

CLKIN

Clock In. Used in conjuction with XTAL, configures the ADSP-21065L to use

either its internal clok generator or an external clock source. The external crystal

should be rated at 1x frequency. Connecting necessary components to CLKIN and

XTAL enables the internal clock generator. The ADSP-21065L's internal clock

generator multiplies the 1x clock to generate 2x clock for its core and SDRAM. It

drives 2x clock out on the SDCLKx pins for SDRAM interface to use. See also

SDCLKx Connecting the 1x external clock to CLKIN while leaving XTAL

unconnected configures configures the ADSP-21065L to use the external clock

source. The instruction cycle rate is 2x CLKIN. CLKIN may not be halted, changed.

or operated below the specified frequency.

Processor Reset. Resets the ADSP-21065L to a known state and begins

______

I/A

RESET

execution at the program memory location specified by the hardware reset vector

address. This input must be asserted (low) at power-up.

TCK

Test Clock (JTAG). Provides an asynchronous clock for JTAG boundary scan.

Test Mode Select JTAG). Used to control the test state machine. TMS has a 20 k

TMS

I/S

internal pull-up resistor.

TDI

I/S

Test Data Input (JTAG). Provides serial data for the boundary scan logic. TDI has

a 20 k internal pull-up resistor.

TDO

Test Data Output (JTAG). Serial scan output of the boundary scan path.

_____

I/A

Test Reset (JTAG). Resets the test state machine. TRST must be asserted

TRST

(pulsed low) after power-up or held low for proper operation of the ADSP-21065L.

TRST has a 20 k internal pull-up resistor.

____

Emulation Status. Must be connected to the ADSP-21065L EZ-ICE target board

EMU (O/D)

connector only.

BMSTR

Bus Master Output. In a multi pprocessor system, indicates whether the asserted

ADSP-21065L is current bus master of the shared external bus. The ADSP-

21065L drives the BMSTR high only while it is the bus master. In a single -

processsor system (ID- 00), the processor drives this pin high.

SDRAM Column Access Strobe. provides the column address. In conjunction

CAS

I/O/T

with RAS MSx, SDWE, SDCLK and sometimes SDA10, defines the operation for

the SDRAM to perform.

____

I/O/T

SDRAM Row Access Strobe. provides the column address. In conjunction with

RAS

CAS MSx, SDWE, SDCLK and sometimes SDA10, defines the operation for the

SDRAM to perform.

Integrated Circuit Diagrams

DSP ADSP21065LKS

part number 254191-001

BMS

Output

1 (Input)

0 (Input)

PS18/28/35 Troubleshooting Guide

Function

Booting Mode

EPROM (Connect BMS

to EPROM chip select.)

Host Processor (HBW

[SYSCON] bit select host

bus width).

No Booting. Processor

executes from external

memory.